Bermond conjectured that if G is Hamilton cycle decomposable, then L(G), the line graph of G is Hamilton cycle decomposable. In this paper, we prove that, for any k > 5, there exists a directed Hamilton cycle decomposable 2-diregular digraph D of order 2k such that L(D) is not directed Hamilton cycle decomposable.
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Scuola Super Sant Anna, Tecip Inst, Via Moruzzi 1, I-56124 Pisa, ItalyUniv Southern Denmark, Dept Math & Comp Sci, Campusvej 55, DK-5230 Odense M, Denmark
Maddaloni, Alessandro
Simonsen, Sven
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Univ Southern Denmark, Dept Math & Comp Sci, Campusvej 55, DK-5230 Odense M, DenmarkUniv Southern Denmark, Dept Math & Comp Sci, Campusvej 55, DK-5230 Odense M, Denmark
机构:
Guangdong Ind Tech Coll, Dept Comp Engn, Guangzhou 510300, Guangdong, Peoples R ChinaGuangdong Ind Tech Coll, Dept Comp Engn, Guangzhou 510300, Guangdong, Peoples R China
Zhang, Zan-Bo
Zhang, Xiaoyan
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Nanjing Normal Univ, Sch Math Sci, Nanjing 210023, Jiangsu, Peoples R China
Nanjing Normal Univ, Inst Math, Nanjing 210023, Jiangsu, Peoples R China
Univ Twente, Fac Elect Engn Math & Comp Sci, NL-7500 AE Enschede, NetherlandsGuangdong Ind Tech Coll, Dept Comp Engn, Guangzhou 510300, Guangdong, Peoples R China
Zhang, Xiaoyan
Wen, Xuelian
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S China Normal Univ, Sch Econ & Management, Higher Educ Mega Ctr, Guangzhou 510006, Guangdong, Peoples R ChinaGuangdong Ind Tech Coll, Dept Comp Engn, Guangzhou 510300, Guangdong, Peoples R China